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Nuclease-Deficient FEN-1 Blocks Rad51/BRCA1-Mediated Repair and Causes Trinucleotide Repeat Instability

机译:核酸酶缺陷的FEN-1阻止Rad51 / BRCA1介导的修复,并导致三核苷酸重复不稳定

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Previous studies have shown that expansion-prone repeats form structures that inhibit human flap endonuclease (FEN-1). We report here that faulty processing by FEN-1 initiates repeat instability in mammalian cells. Disease-length CAG tracts in Huntington's disease mice heterozygous for FEN-1 display a tendency toward expansions over contractions during intergenerational inheritance compared to those in homozygous wild-type mice. Further, with regard to human cells expressing a nuclease-defective FEN-1, we provide direct evidence that an unprocessed FEN-1 substrate is a precursor to instability. In cells with no endogenous defects in DNA repair, exogenous nuclease-defective FEN-1 causes repeat instability and aberrant DNA repair. Inefficient flap processing blocks the formation of Rad51/BRCA1 complexes but invokes repair by other pathways.
机译:先前的研究表明,易于扩增的重复序列会形成抑制人皮瓣内切核酸酶(FEN-1)的结构。我们在这里报告通过FEN-1的错误处理会启动哺乳动物细胞中的重复不稳定。与纯合野生型小鼠相比,FEN-1杂合的亨廷顿氏病小鼠的病程CAG谱显示在代际遗传过程中有收缩膨胀的趋势。此外,对于表达核酸酶缺陷的FEN-1的人类细胞,我们提供了直接证据,表明未经处理的FEN-1底物是不稳定的前兆。在DNA修复中没有内源性缺陷的细胞中,外源核酸酶缺陷的FEN-1会导致重复不稳定和异常的DNA修复。低效的襟翼加工会阻止Rad51 / BRCA1复合物的形成,但会通过其他途径引起修复。

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